In the following pathway, mutation of enzyme II would result in the accumulation of ______________ and the mutant would require _____________ in the media in order to grow
A. Citrulline : arginine
B. Ornithine : citrulline
C. Precursor : ornithine
D. Ornithine : precursor
E. Arginine : citrulline
B
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Complete oxidation of glucose to CO2 involves two different mechanisms for synthesizing ATP, oxidative phosphorylation and substrate-level phosphorylation. Which is true of substrate-level phosphorylation?
A. An enzyme catalyzes the transfer of a phosphate group to ADP from an organic molecule to form ATP. B. Most of the ATP generated in cellular respiration is generated by substrate-level phosphorylation. C. ATP is generated indirectly through the transfer of high-energy electrons from electron carriers to an electron transport chain. D. ATP is generated by release of energy from the electron carriers NADH and FADH2.
Spindles are___
a. permanent cell structures. b. present throughout every step of mitosis. c. present during interphase. d. mainly composed of microtubules. e. all identical.
Microfilaments differ from microtubules in that microfilaments
A) are thicker than microtubules. B) are found only in plants, whereas microtubules are found in both plant and animal cells. C) are mainly composed of actin, whereas microtubules are composed of tubulin. D) help to anchor organelles, whereas microtubules primarily function to help cells change shape and move.
Choose the letter of the best match from the following:A. cognitionB. waggle danceC. navigationD. filial imprintingE. fixed action patternA form of communication in honeybees.
Fill in the blank(s) with the appropriate word(s).